不韋 呂 / UITDSP_ADDA

Class library for internal ADC and DAC connected by SPI. This library support clock generator using TIM3 for switched-capacitor filter to smooth output signal of DAC. This library includes derivative class to support interrupt occured in end of AD conversion. Validated for ST Nucleo F401RE, F411RE. 内蔵 ADC と，SPI 接続の DAC のためのクラスライブラリ．DAC の出力信号を平滑化するためのスイッチトキャパシタフィルタ用のクロックは TIM3 を使用．ST Nucleo F401RE，F411RE で動作を確認．

Dependents:   UITDSP_ADDA_Example UIT2_MovingAv_Intr UIT2_VariableFIR UIT2_VowelSynthesizer ... more

ADC_BuiltIn.cpp

Committer:
MikamiUitOpen
Date:
2015-07-25
Revision:
8:543daa087bd5
Parent:
7:14cdca8b48f8

File content as of revision 8:543daa087bd5:

//------------------------------------------------------
// Class for ADC using TIM2 trigger
//      To get bit definition for register in
//      peripheral, see "stm32f401xe.h"
//
// 2015/04/19, Copyright (c) 2015 MIKAMI, Naoki
//------------------------------------------------------

#include "ADC_BuiltIn.hpp"

namespace Mikami
{
    ADC_BuiltIn::ADC_BuiltIn(PinName pin1, int frequency,
                             PinName pin2, PinName pin3)
        : adc_(pin1), myAdc_(ADC1)
    {
        myAdc_->CR2 = ADC_EXTERNALTRIGCONVEDGE_RISING   // External Trigger on the rising edge
                    | ADC_EXTERNALTRIGCONV_T2_TRGO      // Use Timer2 TRGO event
                    | ADC_CR2_ADON;                     // Enable ADC

        ch1_ = GetChannelNumber(pin1);
        if (pin2 != NC)
        {
            adc2_ = new AnalogIn(pin2);
            ch2_ = GetChannelNumber(pin2);
        }
        if (pin3 != NC)
        {
            adc3_ = new AnalogIn(pin3);
            ch3_ = GetChannelNumber(pin3);
        }
        SetTim2(frequency);
        Select1stChannel();
    }

    // Extract channel number
    uint8_t ADC_BuiltIn::GetChannelNumber(PinName pin)
    {
        uint8_t ch = 0;
        if ((pin & 0x30) == 0x00) ch = pin;
        if ((pin & 0x30) == 0x10) ch = (pin & 0x01) + 8;
        if ((pin & 0x30) == 0x20) ch = (pin & 0x07) + 10;
        return ch;
    }

    void ADC_BuiltIn::SetTim2(int frequency)
    {
        __TIM2_CLK_ENABLE();    // Supply clock, See "stm32f4xx_hal_rcc.h"
        
        SystemCoreClockUpdate();    // Update core clock (for F411RE)
                                    // See system_stm32f4xx.h
        TIM_TypeDef* const myTim = TIM2;

        myTim->CR2 = TIM_CR2_MMS_1; // Update event: as trigger out
        myTim->ARR = SystemCoreClock/frequency - 1; // Auto-reload
        myTim->PSC = 0;             // Prescaler
        myTim->CR1 = TIM_CR1_CEN;   // Enable TIM2
    }
}